Question

sin^2A+sinA=1, FIND cos^2A +cos^4A

Answer 1

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$\sin(a) + { \sin(a) }^{2} = 1 .........i\\ { \cos(a) }^{2} + { \cos(a) }^{4} = \\ \\ \sin(a) = 1 - { \sin(a) }^{2} \\ \: \: \: \sin(a) = { \cos(a) }^{2} - - - - - - x\\ \\ { \cos(a) }^{2} + { \ \cos(a) }^{4} = \sin(a) + { \sin(a) }^{2} (from \: x) \\ = 1(from \:i )$

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Answer 2

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